<?php
/**
 * Created by PhpStorm.
 * User: 刚
 * Date: 2017/7/31
 * Time: 23:01
 */
include_once('BridgeBook.php');

class BridgeBookTitleAuthor extends BridgeBook
{
    function showTitleAuthor()
    {
        return $this->showTitle() . 'by' . $this->showAuthor();
    }
}